WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in MIRM — Mirum Pharmaceuticals, Inc.

CIK 1644956 CHICAGO, IL

Position in MIRM

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$164,453,028

+$133,443,926 QoQ

Shares Held

1,404,741

+318.5% QoQ

Ownership

2.16%

of shares outstanding

% of Portfolio

0.49%

of 13F equity value

Holder Rank

of 328 holders

Holding Since

Jun 2023

9 quarters on record

Voting authority Sole 91% Shared 0% None 9%

Healthcare · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,785,226,604 across 15 Biotechnology names. MIRM ranks #6 (9.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ARGX	Argenx SE	264,617	$245,503,714
2	TWST	Twist Bioscience Corp	2,174,594	$223,722,230
3	KRYS	Krystal Biotech, Inc.	570,153	$211,908,765
4	HALO	Halozyme Therapeutics, Inc.	2,511,050	$196,539,883
5	MDGL	Madrigal Pharmaceuticals, Inc.	324,123	$174,037,844
6	MIRM	Mirum Pharmaceuticals, Inc. This page	1,404,741	$164,453,028
7	PTCT	Ptc Therapeutics, Inc.	1,722,688	$140,519,660
8	CYTK	Cytokinetics Inc	1,603,442	$136,597,223

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$164,453,028	1,404,741	+318.5%	Shares	Sole	2026-08-12
2026-03-31	$31,009,102	335,669	-0.3%	Shares	Sole	2026-05-08
2025-12-31	$26,596,011	336,701	+7.5%	Shares	Sole	2026-02-09
2025-09-30	$22,965,017	313,259	-53.8%	Shares	Sole	2025-11-12
2024-06-30	$23,178,734	677,939	+8.1%	Shares	Sole	2024-08-08
2024-03-31	$15,757,072	627,272	+0.9%	Shares	Sole	2024-05-08
2023-12-31	$18,354,886	621,778	+16.5%	Shares	Sole	2024-02-09
2023-09-30	$16,864,698	533,693	+58.2%	Shares	Sole	2023-11-09
2023-06-30	$8,728,900	337,414	—	Shares	Sole	2023-08-11
No filing history on record for this holder in this stock.